I personally like NM cows for plain skillers; high monster density and quick clear speed. But any area starting at NM Great Marsh and onwards can drop them.
If you want a skiller with 41+ to life any TZ with a char lvl 89+ can farm them from any monster or popable (minus armor/weapon racks).
Interesting. So basically any grand charm in Hell can potentially roll skillers?
Yes, but you want to use grand charms from a high level Terror zone to get access to the best possible affix (+45 life). I believe it's Terror zone level 91+. So if you only roll those charms, you have odds for the best possible outcome. You can re-roll the same one over and over until it gives you something good.
This is my primary use for Perfect Gems... just not amethysts, which are reserved for caster amulets.
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Rhaegar86
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